Makita B-44644 Impact Gold No.10 Torx Insert Bit, 2-Piece Lasts Up to 10X Longer than Standard Insert Bits Designed exclusively for high-torque impact drivers Precision-fit tip engineered to prevent "cam-out" and stripping High-quality steel engineered for use with impact drivers Combine with an Impact Gold bit holder to last up to 15X longer than standard insert bits